MDL on Modern Warfare 3 SS3  

The MK46 is a light machine gun that appears in Call of Duty: Modern Warfare 3 and Call of Duty: Heroes. It was first revealed in the footage released during Call of Duty XP.
Campaign :
Its first usable appearance is in "Bag and Drag", where it can be found in a GIGN armory, and is also carried by friendly non-playable characters. It also appears with a Foregrip in the mission "Dust to Dust", being used by Yuri, and also by Truck in "Scorched Earth".
Special Ops :
The MK46 is available in both Survival and Mission modes.
Survival Mode :
The MK46 is available in Survival Mode at level 34 and costs $7000. Due to its high rate of fire, low recoil, and high damage, it is a very effective weapon. Sleight of Hand is highly recommended, as with all light machine guns.